How to Calculate Insulin Resistance in South Africa

What is Insulin Resistance?

Insulin resistance is a condition where the body’s cells become less responsive to insulin, a hormone that regulates blood sugar levels. As insulin resistance develops, the body requires more insulin to achieve the same effect in reducing blood glucose levels. This increased demand can lead to the pancreas becoming unable to produce enough insulin, ultimately resulting in elevated blood glucose levels and the onset of prediabetes and type 2 diabetes.

Factors contributing to insulin resistance include genetics, excess body weight, inactivity, a diet high in sugars and processed foods, and vitamin deficiencies, especially Vitamin D (learn more about the benefits of Vitamin D and how to take is safely).

Why You Should Care

Insulin Resistance is associated with serious health issues like metabolic syndrome, cardiovascular disease, and polycystic ovary syndrome (PCOS). Identifying and addressing insulin resistance early on, through lifestyle changes such as increased physical activity and healthy eating, can prevent or delay the onset of type 2 diabetes and related health issues.

How to Measure Insulin Resistance

To measure insulin resistance in South Africa, we use the HOMA-IR method calculated in SI units (the International System of Units measuring standard used in South Africa and most countries around the world).

HOMA-IR Method

HOMA-IR stands for Homeostatic Model Assessment of Insulin Resistance. The meaningful part of the acronym is “insulin resistance”. It marks for both the presence and extent of any insulin resistance that you might currently express and reveals the dynamic between your baseline (fasting) blood sugar and the responsive hormone insulin.

How to Calculate your Insulin Resistance Score

Step
1
Blood Test
You will need to go for a blood test that includes your fasting blood glucose and fasting insulin levels. You can do this by visiting your GP or going directly to one of the pathology labs like Ampath or Lancet.
Step
2
Check the Measuring Units
Confirm that your values are in SI units, which are standard for both blood glucose (mmol/L) and insulin (mU/L or µIU/mL) in South Africa.
Step
3
Apply the HOMA-IR Formula
1. Multiply your fasting insulin level (mU/L) by your fasting glucose level (mmol/L).
2. Divide the result by the constant 22.5. This constant is a normalizing factor based on a “normal” healthy individual’s fasting insulin and glucose levels.
3. Formula: HOMA-IR = [Fasting Insulin (mU/L) × Fasting Glucose (mmol/L)] / 22.5

Interpreting Your HOMA-IR Value

HOMA-IR ≤ 1.0: This indicates normal or excellent insulin sensitivity.
HOMA-IR > 1.9: Suggests early signs of insulin resistance.
HOMA-IR > 2.9: Suggests significant insulin resistance.

General Insulin Resistance Ranges *
< 1.0	Excellent Insulin Sensitivity
1.0 – 2.0	Normal
2.0 – 2.9	Early Insulin Resistance
≥ 3.0	Significant Insulin Resistance
* Ranges may vary slightly by lab or doctor

Insulin Resistance Infographic

For quick and easy reference, download this handy infographic on how to calculate insulin resistance, or share it with your friends and family on Pinterest…

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Key Take Aways

With the diets and lifestyles many of us are following these days, knowing your glucose and insulin fasting levels and managing insulin resistance is more important than ever.

Managing insulin resistance requires lifestyle changes such as a balanced diet, avoiding processed foods and sugars, reducing carbohydrates where possible, regular exercise, maintaining a healthy weight, sufficient sleep, and stress management. Vitamins and supplements like Vitamin D, berberine, magnesium glycinate, omega-3 fatty acids, or cinnamon, green tea, ginger and apple cider vinegar have all shown promise in controlling blood sugar and improving insulin sensitivity.